In /etc/apt/sources.list:
###### Ubuntu Main Repos
deb http://au.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
###### Ubuntu Update Repos
deb http://au.archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
Files inside /etc/apt/sources.list.d/ dir:
-rw-r--r-- 1 root root 426 Mar 8 13:19 mail-in-a-box-ppa-trusty.list
-rw-r--r-- 1 root root 354 Mar 8 13:19 mail-in-a-box-ppa-trusty.list.save
-rw-r--r-- 1 root root 124 Mar 8 13:19 ondrej-php-trusty.list
-rw-r--r-- 1 root root 124 Mar 8 13:19 ondrej-php-trusty.list.save